I've been banging my head on the keyboard with this! I'm working on CentOS 6.5 x86_64.

Firstly I tried to update php and apache using easy apache. The update failed very quickly so I went on the usual hunt around the internet. It appears I also can't run yum update. Here is the bottom of the readout:

First troubleshooting step should be to investigate how the CentALT repo is broken. Maybe they changed the path and this box didn't get the update? I would check their website and then manually dig into the repo settings. It obviously worked at one time...
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0xSheepdogJun 13 '14 at 16:01

1 Answer
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I would simply repoint the .repo file for CentALT to one of the mirrors. The main repository indeed seems to be down, I'm only able to browse their top level URL, all the YUM URLs are returning a 403 Forbidden.